Hacker News Reader

I believe the implied meaning is:

+0 -> support from the sidelines (like for a change that doesn't directly affect you)/something that's not urgent but would be nice

-0 -> disagree from the sidelines/disagree with the solution but can't think of a better one

I would enjoy it if they used +ε and -ε for that, although +0 and -0 is probably clearer.

like that idea! Dunno how many people have epsilon easily accessible on their keyboards though.